Design and Optimization of a Novel Permanent Magnet Motor With Hybrid Rotor Configuration for Low Cost and Robust Working Performance

This paper presents a novel interior permanent magnet motor for electric vehicles with low cost and robust working performance. The key innovation of this paper lies in achieving the goal by adopting an asymmetric rotor structure with a hybrid PM arrangement of V and VV, without increasing the amount of PM material or manufacturing costs. Firstly, in order to determine the proper rotor structure, the design principle of PM arrangements and magnetic barrier shapes for robust working performance, considering anti-demagnetization capability and torque performance, is first analyzed by the analytical method and the finite element analysis (FEA) method. And then, multi-objective optimization of the initial motor is carried out to obtain the optimal values of the motor structure parameters that can comprehensively achieve low cost and robust electromagnetic performance. Finally, the effectiveness of the proposed motor is verified by comparing its performance with that of a symmetric rotor motor, and a prototype of the proposed motor is also manufactured for experimental verification.